Coil-spring.



No. 653,155. Patented July 3, I900.

M. TILDEN.

COIL SPRING.

(Application filed. Max. 26, 1900.)

(No Model.)

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the fact that they lack MARSHALL TILDEN, OF l/VILLIMANTIC, CONNECTICUT.

COIL-SPRING.

SPECIFICATION forming part of Letters Patent N 0. 653,155, dated July 3,1900.

Application filed March 26,1900.

T0 at whom it may concern:

Be it known that I, MARSHALL TILDEN, a citizen of the United States,residing at Willimantic, in the county of Windham and State ofConnecticut,have invented certain new and useful Improvements inCoil-Springs; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form a part of this specification.

My invention relates to that class of spiral springs used inupholstering of any kind or for mechanical purposes; and it consists inthe construction and arrangement of parts of the spring, as hereinaftermore fully set forth, described, and particularly claimed.

Various objections arise to the use'of the ordinary spring used inupholstering from a suitable support at the base and so work out ofposition, and when pressed upon they often have a lateral instead of avertical expansive and com pressive movement. Again, the springs oftenout or inj ure the fabric with which they come in contact. Again, in theordinary spring the outer upper coils are practically of little use orstrength when under compression.

The object of my invention is to overcome the objections aboveenumerated and to provide a spring self-supported from the base, sothatsecuring the tops to one another by tying, as is now the custom,becomes unnecessary. Again, all noise is avoided from the fact that thecoils cannot touch each other when compressed.

Figure 1 represents a vertical section of a spiralspringembodyingmyinvention. Figs. 2, 3, and 5 represent similar views of thesame with modifications. Fig. 4 represents a top View.

Referring by letter to the-drawings, ct represents the coils of theinner spring.

a represents an extension of the inner spring, which forms the outerspring. The outer spring increases in diameter to the base, thus forminga support for the inner spring, which prevents it from tipping,increases its Serial No. 10,181. (No model.)

strength, equalizes the resistance to pressure, and gives moreelasticity.

The strength of myspring maybe regulated by the number of coils in theouter spiral.

Any well-known method of fastening the spring at the base may beemployed.

Fig. 2 shows my invention With enlarged surface or extension at top,made by continuing the upper coil one or more coils on the same levelbefore forming the outer spring. Fig. 3 illustrates the same as utilizedin the manufacture of a spring for use in chairseats, one spring beingsufficient for the entire seat. This is an extension of Fig. 2. Theseextensions may be continued indefinately.

Fig. 5 represents an ordinary spring with my support or outer spring.

Fig. 4 shows the coil into which my spring may be compressed forshipment, thus occupying very little space.

What I claim as new is- 1. An extension-spring made of a single piece ofwire, comprising a conical body or spring having its enlarged end at thetop, and another conical spring having its enlarged end. at the base asshown and described.

2. An extension-spring made of a single piece of wire comprising aconical body or spring having its enlarged end at the top, and a lateralextension-top, formed by continuing the upper coil one or more turnsaround the end, and another conical spring having its enlarged end atbase, as shown and described.

3. An extension spring formed of a single piece of wire, comprising onespring encircled by another; the outer spring having a less number ofcoils than the inner spring, formed by continuing the upper coil of theinner spring conically, increasing in diameter to a base horizontal withthe other end of said inner spring.

4. An extension-spring formed of one piece of wire comprising a spiralbody and an outer skirt or support formed by extending the upper coilaround said body to the base; the general direction of said skirt beingdivergent relatively to the general direction of the coils of said body.

5. An extension-spring formed of one piece of wire comprising a spiralbody, a lateral extension-top formed by continuing the upper coil one ormore turns around the end of said body, and an outer spring, having aless number of coils than the inner spring, extending to the base.

6. An extension-spring formed of a single piece of wire, comprising aconical body and a flat or horizontal top formed by continuing the uppercoil one or more turns on the same level, and then conically, each coilincreasing in diameter, to a base horizontal with the other end of saidconical body.

7. An extension-spring formed of a single piece of Wire comprising aconical body and a fiat or horizontal top formed by continuing vMARSHALL TILDEN. Witnesses:

EMILY R. PECK,

B. E. SEITZ.

